Add blueberries, raspberries, vanilla ice cream, milk, and vanilla extract to a blender. Tip: For a thicker shake, freeze the berries for 30 minutes first.

Blend on high speed until smooth and creamy, about 1-2 minutes. Tip: If the shake is too thick, add a splash more milk.

Taste and add honey if you prefer a sweeter shake. Blend again briefly to combine.

Pour into tall glasses and serve immediately with a spoon and straw.